linux-kernel - Re: [PATCH v2 5/7] rust: file: add `Kuid` wrapper

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Date:   Mon, 11 Dec 2023 15:34:37 +0000
From:   Alice Ryhl <aliceryhl@...gle.com>
To:     benno.lossin@...ton.me
Cc:     a.hindborg@...sung.com, alex.gaynor@...il.com,
        aliceryhl@...gle.com, arve@...roid.com, bjorn3_gh@...tonmail.com,
        boqun.feng@...il.com, brauner@...nel.org, cmllamas@...gle.com,
        dan.j.williams@...el.com, dxu@...uu.xyz, gary@...yguo.net,
        gregkh@...uxfoundation.org, joel@...lfernandes.org,
        keescook@...omium.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, maco@...roid.com, ojeda@...nel.org,
        peterz@...radead.org, rust-for-linux@...r.kernel.org,
        surenb@...gle.com, tglx@...utronix.de, tkjos@...roid.com,
        viro@...iv.linux.org.uk, wedsonaf@...il.com, willy@...radead.org
Subject: Re: [PATCH v2 5/7] rust: file: add `Kuid` wrapper

Benno Lossin <benno.lossin@...ton.me> writes:
> On 12/6/23 12:59, Alice Ryhl wrote:
> > +    /// Returns the given task's pid in the current pid namespace.
> > +    pub fn pid_in_current_ns(&self) -> Pid {
> > +        // SAFETY: Calling `task_active_pid_ns` with the current task is always safe.
> > +        let namespace = unsafe { bindings::task_active_pid_ns(bindings::get_current()) };
> 
> Why not create a safe wrapper for `bindings::get_current()`?
> This patch series has three occurrences of `get_current`, so I think it
> should be ok to add a wrapper.
> I would also prefer to move the call to `bindings::get_current()` out of
> the `unsafe` block.

See thread on patch 6.

> > +        // SAFETY: We know that `self.0.get()` is valid by the type invariant.
> 
> What about `namespace`?

I'll update the comment.

Alice